/*
 *    Copyright 2006-2020 the original author or authors.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */
package org.mybatis.generator.plugins;

import java.util.List;

import org.mybatis.generator.api.IntrospectedColumn;
import org.mybatis.generator.api.IntrospectedTable;
import org.mybatis.generator.api.PluginAdapter;
import org.mybatis.generator.api.dom.java.FullyQualifiedJavaType;
import org.mybatis.generator.api.dom.java.InnerClass;
import org.mybatis.generator.api.dom.java.JavaVisibility;
import org.mybatis.generator.api.dom.java.Method;
import org.mybatis.generator.api.dom.java.Parameter;
import org.mybatis.generator.api.dom.java.TopLevelClass;
import org.mybatis.generator.codegen.mybatis3.MyBatis3FormattingUtilities;

/**
 * This plugin demonstrates adding methods to the example class to enable
 * case-insensitive LIKE searches. It shows hows to construct new methods and
 * add them to an existing class.
 *
 * <p>This plugin only adds methods for String fields mapped to a JDBC character
 * type (CHAR, VARCHAR, etc.)
 *
 * @author Jeff Butler
 *
 */
public class CaseInsensitiveLikePlugin extends PluginAdapter {

    public CaseInsensitiveLikePlugin() {
        super();
    }

    @Override
    public boolean validate(List<String> warnings) {
        return true;
    }

    @Override
    public boolean modelExampleClassGenerated(TopLevelClass topLevelClass,
            IntrospectedTable introspectedTable) {

        topLevelClass.getInnerClasses().stream()
        .filter(this::isGeneratedCriteria)
        .findFirst()
        .ifPresent(c -> addMethods(introspectedTable, c));

        return true;
    }

    private boolean isGeneratedCriteria(InnerClass innerClass) {
        return "GeneratedCriteria".equals(innerClass.getType().getShortName()); //$NON-NLS-1$
    }

    private void addMethods(IntrospectedTable introspectedTable, InnerClass criteria) {
        introspectedTable.getNonBLOBColumns().stream()
        .filter(this::isEligibleColumn)
        .map(this::toMethod)
        .forEach(criteria::addMethod);
    }

    private boolean isEligibleColumn(IntrospectedColumn introspectedColumn) {
        return introspectedColumn.isJdbcCharacterColumn()
                && introspectedColumn.isStringColumn();
    }

    private Method toMethod(IntrospectedColumn introspectedColumn) {
        StringBuilder sb = new StringBuilder();
        sb.append(introspectedColumn.getJavaProperty());
        sb.setCharAt(0, Character.toUpperCase(sb.charAt(0)));
        sb.insert(0, "and"); //$NON-NLS-1$
        sb.append("LikeInsensitive"); //$NON-NLS-1$
        Method method = new Method(sb.toString());
        method.setVisibility(JavaVisibility.PUBLIC);
        method.addParameter(new Parameter(introspectedColumn
                .getFullyQualifiedJavaType(), "value")); //$NON-NLS-1$

        method.setReturnType(FullyQualifiedJavaType.getCriteriaInstance());

        sb.setLength(0);
        sb.append("addCriterion(\"upper("); //$NON-NLS-1$
        sb.append(MyBatis3FormattingUtilities
                .getAliasedActualColumnName(introspectedColumn));
        sb.append(") like\", value.toUpperCase(), \""); //$NON-NLS-1$
        sb.append(introspectedColumn.getJavaProperty());
        sb.append("\");"); //$NON-NLS-1$
        method.addBodyLine(sb.toString());
        method.addBodyLine("return (Criteria) this;"); //$NON-NLS-1$
        return method;
    }
}
